Hi PJ2,
Just a thought. Even though the PNF announced the ALT law change about 16 secs after the commencement of the event, the PF didn't acknowledge the law change 'verbally'. Perhaps he was doing just what he had learned about manual flying in Normal Law - pull back a bit on the SS and the aircraft would look after itself. Possibly the same reason could be responsible for him not acknowledging the Stall Warning.
On the other-hand the A/THR had also dropped out, so was he even 'thinking'.
But when it comes to the niceties of PFD color changes, and what the VSI does when you go 'off scale', this was beyond the PF's experience and training. In that respect, I suggest that neither the PNF or the CAPT recognized those significant changes - except I suspect the 'penny had dropped' when the last comment on the CVR was made.